JPH03291129A - Method and apparatus for degassing molten metal - Google Patents
Method and apparatus for degassing molten metalInfo
- Publication number
- JPH03291129A JPH03291129A JP9366990A JP9366990A JPH03291129A JP H03291129 A JPH03291129 A JP H03291129A JP 9366990 A JP9366990 A JP 9366990A JP 9366990 A JP9366990 A JP 9366990A JP H03291129 A JPH03291129 A JP H03291129A
- Authority
- JP
- Japan
- Prior art keywords
- degassing
- molten metal
- melting furnace
- inert gas
- induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007872 degassing Methods 0.000 title claims abstract description 37
- 239000002184 metal Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000002844 melting Methods 0.000 claims abstract description 27
- 230000008018 melting Effects 0.000 claims abstract description 27
- 230000006698 induction Effects 0.000 claims abstract description 24
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 12
- 239000011261 inert gas Substances 0.000 claims abstract description 9
- 229910001208 Crucible steel Inorganic materials 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000012856 packing Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 18
- 239000010959 steel Substances 0.000 abstract description 18
- 239000007789 gas Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【産業上の利用分野１
本発明は、主として鋳鋼を対象とする脱ガス精錬の方法
と、その方法の実施に使用する装置に関する。
【従来の技術】
鋳物の中でも鋼の鋳造物は、用途が主に機械構造部品で
あることから、ガス欠陥（ブローホール）の存在を極力
避けなければならず、溶製した鋳鋼を、鋳造に先立って
十分に脱ガス精錬する必要がある。 脱ガスに高価なＡ
ｒガスなどを使用することは、鋳鋼に関して採算上はと
んど望めないから、脱ガスは真空法によるほかない。
そのほかの鋼に関しても、真空脱ガスは有利な方法であ
って、ＲＨ法はその代表的な技術である。
本発明者は、特殊鋼の製造において盛んに行なわれつつ
あるＬＦ（取鍋精錬）法と、ＲＨ脱ガス法とを複合した
プロセスに伴っていた問題、すなわち
イ） ＬＦと８口の二つの装置が必要で、設備費が嵩
み広いスペースを要すること、
口） ＬＦ精錬とＲＨ脱ガスの所要時間にアンバラン
スがあること、および
ハ） 全体の処理時間が長くなり、その間の熱ロスや耐
火物の損耗が多いこと、
のびとつの解決策として、精錬と脱ガスとを同時に行な
うことのできる取鍋精錬脱ガス装置を共同研究者ととも
に発明し、すでに提案した（特願昭６３−２８９５８１
号）。
その発明の取鍋精錬脱ガス装置は、基本的構成としては
、溶鋼を収容するための、側壁シェルを非磁性の材料で
つくった取鍋、それを囲んで設けた、取鍋内部の溶鋼を
加熱するための誘導コイル、ならびに、溶鋼の真空脱ガ
スを行なうための溶鋼吸上式真空脱ガス槽および真空発
生手段を組み合わせてなる。 この装置を使用すれば、
精錬と脱ガスとがひとつの設備で同時に行なえるから、
従来のように別々の設備を用いて逐次行なっていた場合
にくらべて、設備のスペースが小さくて済むとともに、
処理に要する全体の時間が短縮でき、それがまた、耐火
物の損耗の減少にも役立つという利益がある。
鋳鋼の溶解および鋳造は、１チヤージが比較的少量であ
って、通常は１トンまたはそれ以下である。 取鍋中の
溶鋼にＲＨ法真空脱ガス精錬を行なうとき、溶鋼の量が
少いと冷却が早くて十分な脱ガスができないが、溶鋼を
加熱する手段をそなえた上記発明の装置を用いれば、こ
うした問題は回避できる。 事実、この装置は鋳鋼の脱
ガスに有用であることが実証された。
ところで、鋳鋼にとって、前記のように脱ガス精錬は重
要であるが、その他の精錬に対する要求は、たとえば不
純物や介在物の許容量をはじめ、比較的ゆるやかである
。 従って、材料をえらぶことにより、誘導溶解炉で溶
解して真空脱ガスを行なっただけで鋳造しても、実用上
は差し支えない場合が多いはずである。
このことに想到した発明者は、誘導溶解炉で金属溶湯を
つくり、ＲＨ真空脱ガスを行なって鋳造その他の工程に
移行することを実施し、好成績をおさめた。INDUSTRIAL APPLICATION FIELD 1 The present invention relates to a method for degassing and refining mainly cast steel, and an apparatus used to carry out the method. [Prior art] Steel castings are mainly used as mechanical structural parts, so the presence of gas defects (blowholes) must be avoided as much as possible. It is necessary to thoroughly degas and refine it in advance. A expensive for degassing
Since the use of r-gas and the like is hardly profitable for cast steel, the only way to degas it is by a vacuum method.
Vacuum degassing is also an advantageous method for other steels, and the RH method is a typical technique. The inventor of the present invention has solved the problems associated with a process that combines the LF (ladle refining) method and the RH degassing method, which are becoming increasingly popular in the production of special steel. (1) There is an imbalance in the time required for LF refining and RH degassing, and (3) The overall processing time increases, resulting in heat loss and As a solution to the problem of frequent wear and tear on refractories, we invented and proposed a ladle refining and degassing device that can simultaneously perform refining and degassing (Japanese Patent Application No. 63-289581).
issue). The basic composition of the ladle refining degassing device of that invention is a ladle whose side wall shell is made of a non-magnetic material to accommodate molten steel, and a ladle surrounding the ladle to store the molten steel inside the ladle. It combines an induction coil for heating, a molten steel suction type vacuum degassing tank for vacuum degassing of molten steel, and a vacuum generating means. If you use this device,
Because refining and degassing can be done at the same time in one facility,
Compared to the conventional method of sequentially using separate equipment, the space required for the equipment is smaller, and
The benefit is that the overall time required for processing can be reduced, which also helps reduce wear and tear on the refractory. Each charge of melting and casting of cast steel is relatively small, typically one ton or less. When performing RH method vacuum degassing refining on molten steel in a ladle, if the amount of molten steel is small, it will cool down too quickly and sufficient degassing will not be possible. However, if the apparatus of the above invention equipped with a means for heating molten steel is used, These problems can be avoided. In fact, this device has proven useful for degassing cast steel. Incidentally, although degassing refining is important for cast steel as described above, other refining requirements, such as the permissible amount of impurities and inclusions, are relatively lenient. Therefore, depending on the selection of materials, it may be practically acceptable in many cases to cast the product by simply melting it in an induction melting furnace and performing vacuum degassing. Having come up with this idea, the inventor created a molten metal in an induction melting furnace, performed RH vacuum degassing, and then proceeded to casting and other processes, and achieved good results.
本発明の目的は、このような知見を利用して、誘導炉溶
解とＲ）−１脱ガスとを直結することにより、取鍋精錬
とＲＨ脱ガスとの組み合わせにより得られる利益を確保
した上で、さらに効率を高めた溶解−精錬技術を提供す
ることにある。The purpose of the present invention is to utilize such knowledge to directly connect induction furnace melting and R)-1 degassing, thereby securing the benefits obtained from the combination of ladle refining and RH degassing. Our goal is to provide melting and refining technology with even higher efficiency.
本発明の金属溶湯の脱ガス方法は、下記の諸工程からな
る。
イ〉 誘導溶解炉において金属を加熱溶解して溶湯を得
ること、
口） 得られた金属溶湯中にＲＨ型脱ガス槽の吸い上げ
管を入れるとともに、脱ガス槽と誘導溶解炉上の間を気
密にシールすること、
および
ハ） 気密にシールされた溶湯上部の空間に不活性ガス
を送って非汚染状態に保ち、真空脱ガスを行なうこと。
上記の方法を実施するための本発明の金属溶湯の脱ガス
装置は、下記の構成部分からなる。
ａ〉 金属を加熱するための誘導コイル（２）を有し、
上縁を一周する中空リング（３〉をそなえた誘導溶解炉
（１）、
ｂ） シールフランジ（６〉をそなえたＲＨ型脱ガス槽
（４）および真空発生手段、
Ｃ） 上記の中空リング（３）とシールフランジ（６）
との間を気密にシールするパツキン（７）、ならびに
ｄ〉 溶湯（８）上部の密閉空間（９）に不活性ガスを
供給する手段。
［作 用］
本発明の装置で金属溶湯の脱ガスを行なうには、まず誘
導溶解炉（１）に材料を装入し、誘導コイル（２）に電
力を投入して加熱することにより、材料を溶解する。
必要な元素を添加して合金成分を調整したら、ＲＨ型脱
ガス槽（４）の吸い上げ管（５Ａ、５Ｂ＞を溶湯（８）
中に入れるとともに、脱ガス槽のシール７ランジ（６）
と誘導溶解炉の上縁とを、パツキン（７）で気密にシー
ルする。 パツキン（７）は、中空リング（３）中に冷
却媒体、代表的には水を通して温度上昇を防ぐことによ
って、保護されている。
不活性ガス源（図示してない〉から供給パイプを通して
Ａｒなどの不活性ガスを供給し、溶湯上部に形成された
密閉空間（９）を非汚染雰囲気に保つ。 この操作は、
誘導炉溶解により金属溶湯上に形成されるスラグは、一
般に、層が薄いこともあってシール性が低いため、不可
欠である。
非汚染条件下に真空脱ガス処理を受けた溶湯は、鋳造そ
のほかの次工程へ回すことができる。
［実施例］
図に示した構造で、溶解容量１．０トンの誘導溶解炉を
そなえた本発明の脱ガス装置を製作した。
この装置を用い、５ＵＳ３０４鋼スクラツプを溶解して
温度的１６００℃の溶湯を得た。 誘導コイルに投入し
た電力は、溶解時は杓９００ｋＮ、昇温後は約１２０に
−である。
ＲＨ型真空脱ガス槽を使用し、溶湯をＡ「ガス雰囲気下
に保って真空脱ガスを１０分間行なった。
この処理により、５ＵＳ３０４鋼中の水素含有量は１Ｑ
ｐｐｍから２１）ｌ）Ｉｌｉに低下した。 この鋼にお
いて、ブローホール発生の危険が生じる限界の水素量は
おおよそ４ ｐｐｍとされており、脱ガスされた溶湯は
十分にこの条件をみたしている。（なお、この鋼は、Ｃ
ｒの含有もあって窒素の溶解度は高いから、窒素に起因
するガス欠陥は心配する必要がない。）
上記の溶湯を、１個あたりの重量が約２０ＯＮｇのバル
ブ２個に鋳造した。 γ線を用いた検査で、鋳造品２個
ともガス欠陥が存在しないことを確認した。
［発明の効果］
本発明の真空脱ガス方法および装置は、設備の占めるス
ペースが小さくて済み、１バツチの処理にかかる時間が
短縮できるという利益があり、この利益は、溶湯量が比
較的少量であって脱ガス以外の精錬の要求がきびしくな
い鋼種を対象に実施するとき、とくに顕著になる。
従って本発明は、種々の鋳鋼、鍛鋼、ステンレスｗＡ（
その鋼のスクラップを材料とする場合）の溶解から脱ガ
スを一貫して行ない、とくに次工程が鍛造である場合に
、その意義が発揮される。The molten metal degassing method of the present invention consists of the following steps. (b) To obtain molten metal by heating and melting metal in an induction melting furnace; (2) Inserting the suction pipe of the RH type degassing tank into the obtained molten metal, and keeping the gap between the degassing tank and the top of the induction melting furnace airtight. and c) vacuum degassing by sending an inert gas into the hermetically sealed space above the molten metal to keep it uncontaminated. The molten metal degassing apparatus of the present invention for carrying out the above method consists of the following components. a> has an induction coil (2) for heating metal,
Induction melting furnace (1) equipped with a hollow ring (3〉) surrounding the upper edge, b) RH type degassing tank (4) equipped with a sealing flange (6〉) and vacuum generation means, C) Hollow ring ( 3) and seal flange (6)
A gasket (7) that airtightly seals between the molten metal (8) and a means for supplying inert gas to the closed space (9) above the molten metal (8). [Function] In order to degas the molten metal using the apparatus of the present invention, first, the material is charged into the induction melting furnace (1), and the material is heated by inputting electric power to the induction coil (2). dissolve.
After adding the necessary elements and adjusting the alloy composition, transfer the suction pipes (5A, 5B) of the RH type degassing tank (4) to the molten metal (8).
At the same time, seal the degassing tank 7 langes (6).
and the upper edge of the induction melting furnace are airtightly sealed with a gasket (7). The packing (7) is protected by passing a cooling medium, typically water, through the hollow ring (3) to prevent temperature rise. An inert gas such as Ar is supplied from an inert gas source (not shown) through a supply pipe to maintain a non-contaminated atmosphere in the closed space (9) formed above the molten metal.
Slag, which is formed on molten metal by induction furnace melting, is essential because it generally has a thin layer and has poor sealing properties. Molten metal that has undergone vacuum degassing under non-contaminating conditions can be sent to subsequent processes such as casting. [Example] A degassing apparatus of the present invention having the structure shown in the figure and equipped with an induction melting furnace with a melting capacity of 1.0 tons was manufactured. Using this equipment, 5US304 steel scrap was melted to obtain a molten metal at a temperature of 1600°C. The electric power input to the induction coil was 900 kN during melting and about 120 kN after heating up. Using an RH type vacuum degassing tank, the molten metal was kept in an A gas atmosphere and vacuum degassed for 10 minutes. Through this treatment, the hydrogen content in 5US304 steel was reduced to 1Q.
ppm to 21)l)Ili. In this steel, the limit amount of hydrogen at which the risk of blowhole generation occurs is approximately 4 ppm, and the degassed molten metal satisfies this condition. (This steel is C
Since the solubility of nitrogen is high due to the inclusion of r, there is no need to worry about gas defects caused by nitrogen. ) The above molten metal was cast into two bulbs each weighing approximately 20 ONg. Inspection using gamma rays confirmed that there were no gas defects in either of the two cast products. [Effects of the Invention] The vacuum degassing method and apparatus of the present invention have the advantage that the space occupied by the equipment is small and the time required for processing one batch can be shortened. This becomes especially noticeable when the process is applied to steel types that do not require strict refining requirements other than degassing. Therefore, the present invention applies to various cast steels, forged steels, and stainless steel wA (
When the steel scrap is used as a material, the melting and degassing are performed consistently, and its significance is especially demonstrated when the next process is forging.
図面は、本発明の脱ガス装置の構造を示す縦断面図であ
る。
１・・・誘導溶解炉 ２・・・誘導コイル３・・
・中空リング ４・・・ＲＨ型脱ガス槽５Ａ、５
Ｂ・・・吸い上げ管
６・・・シールフランジ
７・・・パツキン ８・・・溶 瀾９・・・溶
湯上部空間The drawing is a longitudinal sectional view showing the structure of the degassing device of the present invention. 1...Induction melting furnace 2...Induction coil 3...
・Hollow ring 4...RH type degassing tank 5A, 5
B... Suction pipe 6... Seal flange 7... Packing 8... Molten metal flow 9... Molten metal upper space
Claims (3)
こと、 ロ）得られた金属溶湯中にＲＨ型脱ガス槽の吸い上げ管
を入れるとともに、脱ガス槽と誘導溶解炉上の間を気密
にシールすること、 および ハ）気密にシールされた溶湯上部の空間に不活性ガスを
送つて非汚染状態に保ち、真空脱ガスを行なうこと。(1) A method for degassing molten metal, which consists of the following steps: a) obtaining molten metal by heating and melting the metal in an induction melting furnace; At the same time, the space between the degassing tank and the induction melting furnace is airtightly sealed; and c) Inert gas is sent to the airtightly sealed space above the molten metal to keep it in a non-contaminated state, and vacuum degassing is performed. thing.
縁を一周する中空リング（３）をそなえた誘導溶解炉（
１）、 ｂ）シールフランジ（６）をそなえたＲＨ型脱ガス槽（
４）および真空発生手段、 ｃ）上記の中空リング（３）とシールフランジ（６）と
の問を気密にシールするパッキン（７）、 ならびに ｄ）溶湯（８）上部の密閉空間（９）に不活性ガスを供
給する手段。(3) Molten metal degassing device consisting of the following components a) An induction melting furnace (with an induction coil (2) for heating the metal and a hollow ring (3) surrounding the upper edge) (
1), b) RH type degassing tank equipped with a sealing flange (6) (
4) and a vacuum generating means, c) a packing (7) that airtightly seals between the hollow ring (3) and the seal flange (6), and d) a sealed space (9) above the molten metal (8). Means of supplying inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9366990A JPH03291129A (en) | 1990-04-09 | 1990-04-09 | Method and apparatus for degassing molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9366990A JPH03291129A (en) | 1990-04-09 | 1990-04-09 | Method and apparatus for degassing molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03291129A true JPH03291129A (en) | 1991-12-20 |
Family
ID=14088812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9366990A Pending JPH03291129A (en) | 1990-04-09 | 1990-04-09 | Method and apparatus for degassing molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03291129A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6830723B2 (en) | 2001-10-01 | 2004-12-14 | Alcan International Limited | Apparatus for treating molten metal having a sealed treatment zone |
| JP2009012025A (en) * | 2007-07-03 | 2009-01-22 | Sukegawa Electric Co Ltd | Inductive circulation gas discharge device for molten metal |
-
1990
- 1990-04-09 JP JP9366990A patent/JPH03291129A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6830723B2 (en) | 2001-10-01 | 2004-12-14 | Alcan International Limited | Apparatus for treating molten metal having a sealed treatment zone |
| JP2009012025A (en) * | 2007-07-03 | 2009-01-22 | Sukegawa Electric Co Ltd | Inductive circulation gas discharge device for molten metal |
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